Decolourization and mineralization of commercial reactive dyes by using homogeneous and heterogeneous Fenton and UV/Fenton processes.
The oxidative decolourization and mineralization of three reactive dyes in separately prepared aqueous solutions C.I. Reactive Yellow 3 (RY3), C.I. Reactive Blue 2 (RB2) and C.I. Reactive Violet 2 (RV2) by using homogeneous and heterogeneous Fenton and UV/Fenton processes have been investigated. The effects of H(2)O(2), Fe(2+) and Fe(0) concentrations, Fe(2+)/H(2)O(2) and Fe(0)/H(2)O(2) molar ratios at pH 3 and T=23+/-1 degrees C have been studied. Optimal operational conditions for the efficient degradation of all three dye solutions (100 mg L(-1)) were found to be Fe(2+)/H(2)O(2)=0.5mM/20mM and Fe(0)/H(2)O(2)=2mM/1mM. The experimental results showed that the homogeneous Fenton process employing UV irradiation was the most effective. By using this process, the high levels of mineralization (78-84%) and decolourization (95-100%) were achieved. Pseudo-first-order degradation rate constants were obtained from the batch experimental data.
Papić
Sanja
S
Department of Polymer Engineering, Faculty of Chemical Engineering and Technology, University of Zagreb, Zagreb, Croatia. spapic@fkit.hr
Vujević
Dinko
D
Koprivanac
Natalija
N
Sinko
Danijel
D
D004396:Coloring Agents / Q000737:chemistry* / Q000528:radiation effects; D006861:Hydrogen Peroxide / Q000737:chemistry; D007501:Iron; D007700:Kinetics; D010084:Oxidation-Reduction; D014227:Triazines; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000528:radiation effects; D018508:Water Purification / Q000379:methods
D004396:Coloring Agents; C045076:Fenton's reagent; D014227:Triazines; D014874:Water Pollutants, Chemical; C012842:Cibacron Blue F 3GA; D006861:Hydrogen Peroxide; D007501:Iron